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Simplified loss of load probability constraint formula-based power system spinning reserve optimization method

A technology of loss of load probability and rotating standby, which is applied in the direction of single-net parallel feeding arrangement, etc., can solve the problems of not necessarily good reliability, poor calculation accuracy, and many standby configurations, and achieve good optimization results, targeted, The effect of improving computational efficiency

Active Publication Date: 2016-12-21
CHINA ELECTRIC POWER RES INST +4
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Problems solved by technology

In the process of calculating the unit combination model with LOLP constraints, many methods ignore the secondary tradeoffs, resulting in poor calculation accuracy. The result is often too many spare configurations, poor economy, and not necessarily good reliability.

Method used

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  • Simplified loss of load probability constraint formula-based power system spinning reserve optimization method
  • Simplified loss of load probability constraint formula-based power system spinning reserve optimization method
  • Simplified loss of load probability constraint formula-based power system spinning reserve optimization method

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the drawings and embodiments.

[0032] Such as figure 1 As shown, an optimization algorithm for spinning reserve based on LOLP simplified constraints includes:

[0033] Step 1. Run the basic unit combination without considering standby, and get the status of each unit;

[0034] Step 2: Find the marginal crew according to the crew plan;

[0035] Step 3. Simplify the LOLP expression. In the LOLP expression, only marginal units are considered. After simplification, the LOLP given in the LOLP constraint max Reduced to 0;

[0036] Step 4. Use MILP to calculate the unit commitment model with simplified LOLP constraints;

[0037] Step 5. Based on the result of (4), set the minimum reserve so that the reserve meets the predetermined setting, that is, the reserve must be satisfied so that the unit with a capacity smaller than the marginal unit will not cause LOLP;

[0038] Step 6. Run a unit combination with a minimu...

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Abstract

The present invention discloses a simplified loss of load probability constraint formula-based power system spinning reserve optimization method. According to the method, with the spinning reserve of units adopted as an optimization variable, the sum of the operating cost and reserve cost of the units adopted as an objective function, online units are sorted according to the capacities of the units, marginal units are found out; loss of load probability (LOLP) simplification is carried out with only the marginal units considered; and a unit commitment problem involving a simplified LOLP expression is solved through using a mixed integer linear programming method under set constraint conditions. Since the LOLP simplification is carried out with only the marginal units considered, a compromise between the primary and secondary relations of economical efficiency and reliability of an LOLP original constraint formula can be kept, and an optimization result is better, and computational efficiency can be improved.

Description

Technical field [0001] The invention relates to a power system spinning reserve optimization method based on simplified load loss probability constraints. Background technique [0002] Spinning reserve is an effective measure to deal with load shedding that may be caused by power system failures, and can increase the reliability of the power system. However, the allocation of spares will increase additional costs and make the economy worse. The number of spare configurations needs to strike a balance between reliability and economy. [0003] Spinning reserve configuration adopts deterministic methods without considering the random characteristics of the system. At present, many optimization methods for spinning reserve at home and abroad use probabilistic methods, such as adding loss of load probability (LOLP) indicator constraints to the constraints. LOLP is related to the status, output, reserve and total reserve of the unit during this period. It is highly non-linear and combi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/46
CPCH02J3/46
Inventor 陈海惠慧赵明欣张逸周莉梅刘伟吴文宣马丽崔艳妍刘文亮熊军韦涛苏剑陈育欣
Owner CHINA ELECTRIC POWER RES INST
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